19又9分之4+9又19分之4÷(2又9分之7+1又19分之6)
=175/9+175/19÷(25/9+25/19)
=175/9+175/19*9*19÷(25/9*9*19+25/19*9*19)
=175/9+175*9÷(25*19+25*9)
=175/9+175*9÷(25*28)
=175/9+9/4
=700/36+81/36
=781/36
19又9分之4+9又19分之4÷(2又9分之7+1又19分之6)
=175/9+175/19÷(25/9+25/19)
=25*7/9+25*7/19÷(25/9+25/19)
= 7
25*7=175
好像不能哎